In motion dimensioning system for cuboidal objects

• US 5,831,737 A
• Filed: 06/02/1997
• Issued: 11/03/1998
• Est. Priority Date: 06/29/1995
• Status: Expired due to Fees

• Current Assignee: Quantronix Incorporated (Schneider Electric SE)
• Original Assignee: Quantronix Incorporated (Schneider Electric SE)
• Inventors: Elwood, Michael K., Stringer, Bradley J., Badger, Lee W.
• Primary Examiner(s): Rosenberger, Richard A.
• Application Number:
  US08/867,730
• Time in Patent Office: 519 Days
• Field of Search: 356/383, 356/385, 356/379, 356/372, 356/376, 356/380, 356/381, 250/223 R, 250/559.24
• US Class Current: 356/634
• CPC Class Codes: G01B 11/00 Measuring arrangements characterised by the use of optical techniques
• CPC Class Codes: G01B 11/04 specially adapted for measuring length or width of objects while moving
• CPC Class Codes: G01B 17/00 Measuring arrangements characterised by the use of infrasonic, sonic or ultrasonic vibrations

Abstract

An in-motion measuring system for determining the length and width of linearly-moving cuboidal objects through the use of object speed, the times during which four light beams oriented across the path of the object are obstructed by the object, and the angles of the light beams with respect to the direction of object movement. The height of an object may also be determined through use of a vertically-extending light curtain with horizontally-oriented light beams, or via an ultrasonic sensor.

Claims

1. An apparatus for measuring the length and width of a linearly-moving object having a rectangular boundary traveling at a determinable rate along a predetermined path, comprising:

beam emitters for emitting first, second, third and fourth light beams across said path of said linearly-moving object so as to be interrupted by the passage thereof, each of said beam emitters being oriented to emit beams so that each of said beams is in non-parallel orientation to each of the other three beams;

a timing mechanism for determining first, second, third and fourth times during which each of said respective first, second, third and fourth light beams is interrupted by the passage of said object;

a speed sensing mechanism for determining magnitude of said rate; and

a processor for calculating said length and said width of said rectangular object using said determined first, second, third and fourth times and a determined magnitude of said rate.

2. The apparatus of claim 1, wherein said timing mechanism for determining said times comprises means for receiving each of said light beams, and a clock associated with said receiving means for measuring first, second, third and fourth time intervals when said first, second, third and fourth light beams are not received by said receiving means.

3. The apparatus of claim 1, wherein said timing mechanism for determining the magnitude of said substantially constant rate comprises:

first and second timing sensors longitudinally spaced along said path of said object at a predetermined distance;

a clock associated with said timing sensors;

said first timing sensor starting said timing sensor clock responsive to passage of a leading edge of said object thereby, and said second timing sensor stopping said clock responsive to the passage of said leading object edge thereby to establish a time interval; and

means for computing said rate magnitude from said time interval and said predetermined distance.

4. The apparatus of claim 3, wherein said timing sensors comprise light beam sensors.

5. The apparatus of claim 1, further including means for measuring the height of said object.

6. The apparatus of claim 5, wherein said means for measuring the height of said object comprises a vertically extending light curtain employing horizontally-oriented light beams.

7. The apparatus of claim 1, wherein said first and second light beams are paired in orthogonal relative orientation, said third and fourth light beams are paired in orthogonal relative orientation, and said first and second paired light beams are rotated 45°

about an axis vertically perpendicular to said path of said linearly-moving object with respect to said third and fourth paired light beams.

8. The apparatus of claim 7, wherein said first and third light beams are oriented at a 22.5°

angle to said path of said linearly-moving object, and said second and fourth light beams are oriented at a 67.5°

angle to said path of said linearly-moving object.

9. The apparatus of claim 8, wherein said first and third light beam emitters are aimed toward a common point, and said second and fourth light beam emitter means are aimed toward a common point.

10. The apparatus of claim 9, wherein said first, second, third and fourth light beam emitters are placed on the same side of said path of said linearly-moving object.

11. The apparatus of claim 1, wherein said processor for calculating comprises a microprocessor.

12. The apparatus of claim 1, wherein said light beam emitters are oriented to emit said first, second, third and fourth light beams in one or more parallel planes parallel to the plane of movement of said linearly-moving object.

13. The apparatus of claim 1, wherein said speed sensing mechanism comprises a mechanism for determining speed of a conveyor moving said object.